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Related Party Transactions - Icahn Enterprises (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 12, 2018
Mar. 31, 2018
Mar. 31, 2017
Related Party Transaction [Line Items]      
Dividends paid (in dollars per share) $ 0.50    
Payments of dividends $ 43.4 $ 43.4 $ 43.4
IEP Energy LLC      
Related Party Transaction [Line Items]      
Ownership percentage held by controlling stockholder   82.00%  
Payments of dividends $ 35.6